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x in (-oo:+oo)
11 = 12-(x/a) // - 12-(x/a)
x/a-12+11 = 0
a^-1*x-1 = 0 // + 1
a^-1*x = 1 // : a^-1
x = 1/(a^-1)
x = 1/(a^-1)
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